Pre-authentification computer system login method based on high collision probability hash function

The invention discloses a pre-authentification computer system login method based on high collision probability hash function. According to the method, password pre-authentification is performed when user login is realized in local by encrypting a user login password by mainly utilizing a one-way hash function and storing the user login password at a client, so that the authentification operation burden caused by responding misinput and brute force attack on a system is lightened; and simultaneously, in order to improve the safety, the collision probability of the one-way hash functions adopted by the client in local is very high, so that the cracked result is unrelated to the password even when the local crack attack occurs. By the method, the system authentification burden is lightened by pre-authentification, and the password cannot be cracked by the password authentification information stored in local, so that the method is practical, safe and reliable.